Vasun Poengsungnoen

Platygramme subarechavaletae is a species of script lichen in the family Graphidaceae. Found in Thailand, it was formally described as a new species in 2014 by lichenologists Vasun Poengsungnoen and Klaus Kalb. The type specimen was collected by the first author from the Phu Luang Wildlife Sanctuary (Loei) at an elevation of 1,468 m (4,816 ft), there it was found growing on an unidentified tree in a lower montane scrub. The lichen has a grey to yellowish-green thallus with a smooth and dull surface. The species epithet alludes to its resemblance to Platygramme arechavaletae.

Phlyctis sirindhorniae is a little-known species of corticolous (bark-dwelling), crustose lichen in the family Phlyctidaceae. It shares some similarities with Phlyctis agelaea but can be distinguished by its smaller ascospores, larger apothecia, and a higher number of ascospores per ascus. It is only known to exist in a specific location in northeastern Thailand.

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Ionaspis aptrootii is a species of saxicolous (rock-dwelling), crustose lichen in the family Hymeneliaceae. It occurs in New Guinea and Thailand.

Graphis khaoyaiensis is a rare species of corticolous (bark-dwelling) script lichen in the family Graphidaceae. Found only in a specific region in Thailand, it closely resembles Graphis dichotoma but can be distinguished by its smaller ascospores and the absence of radiately branched lirellae.

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Astrochapsa elongata is a little-known species of corticolous (bark-dwelling), crustose lichen in the family Graphidaceae. Found only in a specific region of Thailand, it is closely related to Astrochapsa recurva, yet distinguishes itself through its narrower ascospores and absence of secondary metabolites.

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